module.exports = (sql, params = null) => {
  const mysql = require("mysql");
  const conn = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: "root",
    database: "bigevent",
  });
  return new Promise((resolve, reject) => {
    conn.connect();
    conn.query(sql, params, (err, result) => {
      err ? reject(err) : resolve(result);
    });
    conn.end();
  }).catch((err) => {
    console.log(err.sqlMessage);
    //这里输出 err.message 也可以
  });
};
